I need a 1" 15psi soft seal pressure relief valve.We are building a high voltage test chamber that will be filled with sulfur hexafluoride (SF6) to prevent arching. The plan for the chamber is to pump it out to around 10^-3 torr or lower (aka higher vacuum) then to fill it with SF6 up to 1 atm (gauge pressure not absolute). My understanding is that if the pressure is kept below 15 psi above atmospheric pressure we do not have to certify it as a pressure vessel so that's the reason we need the relief valve. The main reason I believe the Kunkle valve failed is that they are adjustable and 15psi is the lowest value offered so the tolerances were horrible when they would be acceptable at 150 psi. If someone can find a non adjustable valve I think that would be best.Use a check valve with a 15 lbs setting.

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